Supress data loss warnings in VS2015

Where safe, use explicit casts to supress data loss warnings in VS2015
compiler.

This fixes #45.

Signed-off-by: Alex Radutskiy ([email protected])
Signed-off-by: Thiago Macieira <[email protected]>

Author: alradmsft

src/cborencoder.c

@@ -290,7 +290,7 @@ static inline CborError encode_number_no_update(CborEncoder *encoder, uint64_t u
     if (ui < Value8Bit) {
         *bufstart += shiftedMajorType;
     } else {
-        unsigned more = 0;
+        uint8_t more = 0;
         if (ui > 0xffU)
             ++more;
         if (ui > 0xffffU)

src/cborparser.c

@@ -155,7 +155,7 @@ static CborError extract_length(const CborParser *parser, const uint8_t **ptr, s
         return err;
     }
 
-    *len = v;
+    *len = (size_t)v;
     if (v != *len)
         return CborErrorDataTooLarge;
     return CborNoError;
@@ -799,13 +799,13 @@ CborError cbor_value_get_int_checked(const CborValue *value, int *result)
         if (unlikely(v > (unsigned) -(INT_MIN + 1)))
             return CborErrorDataTooLarge;
 
-        *result = v;
+        *result = (int)v;
         *result = -*result - 1;
     } else {
         if (unlikely(v > (uint64_t)INT_MAX))
             return CborErrorDataTooLarge;
 
-        *result = v;
+        *result = (int)v;
     }
     return CborNoError;
 

src/compilersupport_p.h

@@ -210,7 +210,9 @@ static inline unsigned short encode_half(double val)
         /* underflow, make zero */
         return 0;
     }
-    return sign | ((exp + 15) << 10) | mant;
+
+    /* safe cast here as bit operations above guarantee not to overflow */
+    return (unsigned short)(sign | ((exp + 15) << 10) | mant);
 #endif
 }